AFE with Dual 16-Bit 1.1MSPS ZDS A/D Converter

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The AK9242NK is an analog front end that is optimized for high resolution encoders.
ZDS A/D converter AK9242NK integrates 2-channel simultaneous sampling A/D converter, a programmable gain amplifier (PGA) and a transimpedance amplifier for current input in a small 4mm x 4mm QFN package. Current / Voltage input for the AK9242NK can be selected. In addition, it has polar coordinates output function (angle calculation algorithm).
The AK9242NK realizes 16-bit resolution while supporting the sampling rate up to 1.1MHz. A small high accuracy encoder can easily be designed with the AK9242NK. A pin compatible lineup, the AK9243NK (14-bit) is also available.

AK9242AFE AK9242NK

(*) ZDS: Zero Latency Delta Sigma

A ZDS A/D converter realizes ultrafast response of SAR while maintaining high accuracy conversion like a delta-sigma converter, based on AKM’s accumulated experience and know-how in analog-digital LSI technology. It contributes to improving the speed and the accuracy of negative feedback circuits. It has long acquisition time comparing with an SAR A/D converter, reducing input buffer load of the IC. Small and high accurate motor systems can be designed with a ZDS A/D converter.

Key Features

● AK9242NK |  Analog Front End with 2ch 16 bit 1.1MHz ZDS A/D Converter
 Product Name  AK9242NK
 Analog Front End with ZDS A/D Converter
 Analog Front End with ZDS A/D Converter
 ● Resolution  16-bit  14-bit
 ● S/N  81dB(Typ.) at 10kHz Input  80dB(Typ.) at 10kHz Input
 ● Integral Nonlinearity (INL)  ±2 LSB (Typ.) @ Vin=-6dBFS  ±1 LSB (Typ.) @ Vin=-6dBFS
 ● Differential Nonlinearity (DNL)  No Missing Code
 ● Number of Channel  2ch (Simultaneous Sampling)
 ● Input Format  Differential Input
 ● Function  Transimpedance Amplifier for Current Input
 Programmable Gain Amplifier (14-35dB, 3dB step)
 Polar Coordinates Output Function (angle calculation algorithm)
 Offset/Gain Adjustment Function
 Bandwidth Limit Filter
 ● Power Consumption  505mW (fs=1.1MSPS, HVDD= 5V,DRVDD=3V)
 ● Power Supply  HVDD: 4.75 to 5.25V  DRVDD: 2.7 to 5.25V
 ● Operational Temperature Range
 ● Package
 Ultra Small Package 24-pin QFN (4mm x 4mm)

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Block Diagram

Block Diagram

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